Physics Chapter 10 Entry test MCQs
26. If an A.C voltage of rms value of 10V is applied as input of half wave rectifier, then the rms voltage value of D.C output will be
a. 10V
b. 10.3V
c. 10.7V
d. 9.3V
27. If a half-wave rectifier is used to convert 50Hz A.C into D.C then the number of pulses present in rectifier voltage is:
a. 50
b. 25
c. 75
d. 100
28. The output from a full wave rectifier is
a. An ac voltage
b. Uni-directional
c. Pulsating de
d. Both B and C
PAST PAPER MCQS
29. Conversion of alternating current into direct current is called
a. Regeneration
b. Regeneration
c. Oscillation
d. Amplification
30. Output voltage of rectifier is not smooth. It can be made smooth by using a circuit known as:
a. Bridge circuit
b. Wheat stone circuit
c. Filter circuit
d. Ripple circuit
31. in the following figure what happens for the positive half cycle of the input?
a. D1 and D3 conducts
b. D4 and D2 conducts
c. D1 and D2 conducts
d. D4 and D3 conducts
32. In case of half wave rectification, resistance of diode during negative half of A.C is:
a. Very low
b. Very high
c. Negligible
d. A few ohms
33. The direction of current through the load resistance of a full-wave rectification circuit:
a. Changes for every cycle
b. Inverts for negative cycle
c. Remains constant
d. Inverts for positive cycle
34. In full wave rectification, the diodes are used
a. 3
b. 1
c. 4
d. 2
35. Which has less ripple factor
a. Half wave rectifier
b. Full wave rectifier
c. Both
d. None
36. Ripple factor of full wave rectifier?
a. 0.21
b. 0.482
c. 0.84
d. 1.21
37. If f=50Hz then in half wave no of pulses are
a. 100
b. 50
c. 150
d. 60